Year	per 1000 people
1960	1.1
1965	1.2
1970	1.2
1975	1.3
1976	1.3
1977	1.3
1978	1.4
1979	1.4
1980	1.5
1981	1.5
1982	1.6
1983	1.6
1985	1.7
1986	1.7
1987	1.8
1988	1.8
1989	1.8
1990	1.8
1991	1.9
1992	1.9
1993	1.9
1995	2.428
1996	2
1997	2.1
1998	2.1
1999	2.2
2000	2.583
2001	2.2
2002	2.3
2004	2.704
2006	2.402
2007	2.41
2008	2.416
2009	2.422
2010	2.429
2011	2.458
2012	2.492
2013	2.554
2014	2.568